CVE-2021-27245

CVSS V2 High 9.3 CVSS V3 High 8.1
Description
This vulnerability allows a firewall bypass on affected installations of TP-Link Archer A7 prior to Archer C7(US)_V5_210125 and Archer A7(US)_V5_200220 AC1750 routers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of IPv6 connections. The issue results from the lack of proper filtering of IPv6 SSH connections. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of root. Was ZDI-CAN-12309.
Overview
  • CVE ID
  • CVE-2021-27245
  • Assigner
  • zdi-disclosures@trendmicro.com
  • Vulnerability Status
  • Analyzed
  • Published Version
  • 2021-03-29T21:15:12
  • Last Modified Date
  • 2021-04-01T18:46:55
Weakness Enumerations
CWE URL
CWE-693 http://cwe.mitre.org/data/definitions/693.html
CPE Configuration (Product)
CPE Vulnerable Operator Version Start Version End
AND
cpe:2.3:o:tp-link:archer_a7_firmware:*:*:*:*:*:*:*:* 1 OR c7\(us\)_v5_210125
cpe:2.3:h:tp-link:archer_a7:-:*:*:*:*:*:*:* 0 OR
AND
cpe:2.3:o:tp-link:archer_a7_firmware:*:*:*:*:*:*:*:* 1 OR a7\(us\)_v5_200220
cpe:2.3:h:tp-link:archer_a7:-:*:*:*:*:*:*:* 0 OR
CVSS Version 2
  • Version
  • 2.0
  • Vector String
  • AV:N/AC:M/Au:N/C:C/I:C/A:C
  • Access Vector
  • NETWORK
  • Access Compatibility
  • MEDIUM
  • Authentication
  • NONE
  • Confidentiality Impact
  • COMPLETE
  • Integrity Impact
  • COMPLETE
  • Availability Impact
  • COMPLETE
  • Base Score
  • 9.3
  • Severity
  • HIGH
  • Exploitability Score
  • 8.6
  • Impact Score
  • 10
CVSS Version 3
  • Version
  • 3.1
  • Vector String
  • CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
  • Attack Vector
  • NETWORK
  • Attack Compatibility
  • HIGH
  • Privileges Required
  • NONE
  • User Interaction
  • NONE
  • Scope
  • UNCHANGED
  • Confidentiality Impact
  • HIGH
  • Availability Impact
  • HIGH
  • Base Score
  • 8.1
  • Base Severity
  • HIGH
  • Exploitability Score
  • 2.2
  • Impact Score
  • 5.9
References
Reference URL Reference Tags
https://www.zerodayinitiative.com/advisories/ZDI-21-214/ Third Party Advisory VDB Entry
Sources
Source Name Source URL
NIST https://nvd.nist.gov/vuln/detail/CVE-2021-27245
MITRE https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27245
History
Created Old Value New Value Data Type Notes
2022-05-10 07:17:29 Added to TrackCVE
2022-12-06 00:36:57 2021-03-29T21:15Z 2021-03-29T21:15:12 CVE Published Date updated
2022-12-06 00:36:57 2021-04-01T18:46:55 CVE Modified Date updated
2022-12-06 00:36:57 Analyzed Vulnerability Status updated